Why would you use Mitchum anyway ? To answer ur question, no i've never gotten a deodarant rash, sry bro ur on ur own with this one.This is the only shit i can think of that MIGHT help and it's gonna feel really fuckin weird but try some of that calomine lotion or some aveeno(the one with oatmeal in it). As with any rash don't fuckin scratch it that makes it about 10 times worse specially if u break the skin open.

When I decided to try out the Old Spice Arctic whatever I started to get a rash, and whenever I would put the deoderant on it would burn. It did this for a few days then went a way for like a couple weeks then it would come back and leave again.